材料力学课件第10章 动荷载

1、2021-11-22 PaxmmPaxmmPaPaagPagPNstF)(1(NdAgxPgaF AgxPF NstNstdNdFKF stdNstdNdd KAFKAF stdd KxmmPAg xmmAgAa agPP NdF stddK xmmAg AaAg agPP PNdFNstFlxmnaxaNdqstqG)1()(stNdgaAgxxqqFG )1(NddgaxAF AaqG stmaxddmax KgaK 1d()()Nd1aFGqlg()()Ndd11FaGqlAAg )8 . 921)(605 .251050(109 . 2134 214MPa300MPa rO rO rO

2、 qd2)2)(1(22dDADAq 2n2 Da OqdyFd d d(d )2Dq 4222dNdDAFF 2)2)(1(22dDADAq 2 dsin4 sin)d2(220220ddDADADqF 422NddDAF FNdFNd2dvg Fdoqdy d FNdFNd422ddDAF 2dv)d2(d Dq2Dv FGlO22nGFmaRmlG/g AFG/ ( )2GFGlAg R0R1l叶叶根根顶顶部部转转轴轴R0R1ld mmx叶叶根根顶顶部部转转轴轴)211()(0lxAxAd( )dmA )(02n RaR0R1ld mmx叶叶根根顶顶部部转转轴轴20d() dFmR 20

3、() ( )dARFNxdFxmmR0R1ld mmx叶叶根根顶顶部部转转轴轴dFF 20() ( )dlxAR lxxARF )d()(N0 02 2dFFNxxmmR0R1ld mmx叶叶根根顶顶部部转转轴轴4330202NmaxlRlAF 11()()200Nmax051134FvRRgARR RRl011vR dPFNxxmmR0R1ld mmx叶叶根根顶顶部部)()d(NxEAdxFlx N0d( )lxFlxEA x 22031132(ln2)(ln2) 42183lllRE机械能守恒定律机械能守恒定律dVVT vhhhd0T)(d hPVdd d1VF2 dd d()1P hF2

4、d d stFP dd stFP d st d d 21)(PhP hddVVT dV0 02 22 22 2 st d st d h)(st st st st st d hh2 21 11 12 28 84 42 22 2 st dst st d K)h( 2 21 11 1st d hK2 21 11 1 d dddd stddstFKFK PPK hlAPBd FdAB)(d hPV0Tddd21FV hlAPBd FdAd dFlEA EAlP st lEAPst ddd21)( FhP 2dddd)(2121 lEAFV dd)( lEAF ABd dFAPBhlABPst st s

5、t d h2 21 11 10 02 22 22 2 hst d st d d st211hK APBhlABABd dPPst d st2hK11 st dd K ddFKPstdd K 2 22 21 11 1 st d hKh22vhg std211hK2 st11vg h0v2202vvgh 2d st11vKg 20 st211vghg hIEaP3 34 43 3 st 3 32 23 31 11 12 21 11 1aPhIEhK st d WaPaPhIEK)(maxstdmaxd3 32 23 31 11 1 1PaaPaPamaxstdmaxdK maxstdmaxdwKw stdHK211 mm310mm1220012010103)102(1013333333 EIGlwmaxstst631040211 dK2.5MPaMPa20012010210166G2332 bhlWMmaxmaxstmm310ststmax w15MPa6MPa2.5dmax 20mm6mm310dmax w2dddFV 22vgGT 222vgGFdd dstddKGF stdgvK22 stdgvK2 lvddFEIGlst33 WGlWMmaxmaxst glGEIWvWGlEIGlgvKmaxstdmaxd3332 三、其它类型的冲击问题三、其它类型的冲击问题